[PATCH v4 19/22] drm/tilcdc: Add prints on sync lost and FIFO underrun interrupts

[Jyri Sarha]

Add ratelimited prints on sync lost and FIFO underrun interrupts.

Signed-off-by: Jyri Sarha <jsarha at ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 8 ++++++++
 drivers/gpu/drm/tilcdc/tilcdc_drv.c  | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c 
b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index b1df046..5ee22c6 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -717,6 +717,14 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
                tilcdc_write(dev, LCDC_END_OF_INT_IND_REG, 0);
        }

+       if (stat & LCDC_SYNC_LOST)
+               dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
+                                   __func__, stat);
+
+       if (stat & LCDC_FIFO_UNDERFLOW)
+               dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow",
+                                   __func__, stat);
+
        return IRQ_HANDLED;
 }

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c 
b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index d96083d..41ec890 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -382,7 +382,7 @@ static int tilcdc_irq_postinstall(struct drm_device *dev)
                tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG,
                           LCDC_V2_UNDERFLOW_INT_ENA |
                           LCDC_V2_END_OF_FRAME0_INT_ENA |
-                          LCDC_FRAME_DONE);
+                          LCDC_FRAME_DONE | LCDC_SYNC_LOST);
        }

        return 0;
@@ -401,7 +401,7 @@ static void tilcdc_irq_uninstall(struct drm_device *dev)
                tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
                        LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
                        LCDC_V2_END_OF_FRAME0_INT_ENA |
-                       LCDC_FRAME_DONE);
+                       LCDC_FRAME_DONE | LCDC_SYNC_LOST);
        }
 }

-- 
1.9.1